*{
    margin: 0;
    padding: 0;
    list-style: none;
    box-sizing: border-box;
}
.box{
    width: 100%;
    height: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
}
header{
    height: 50px;
    background: #add8fb;
    display: flex;
    align-items: center;
}
header span{
    width: 100px;
    text-align: center;
}
header p{
    flex: 1;
    text-align: center;
}
main{
    flex: 1;
    height: 100%;
    overflow-y: scroll;
    border: 3px solid #add8fb;
}
main .con{
    width: 100%;
    height: 200px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}
main .con a{
    width: 20%;
    text-decoration: none;
    color: #000;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
main h4{
    height: 50px;
    line-height: 24px;
    border: 3px dotted #add8fb;
    border-right: none;
    border-left: none;
}
footer{
    height: 50px;
    background: #add8fb;
}